Fastener



FIG. 1 is a top, front, right-side perspective view of a fastener;

FIG. 2 is a bottom, front, right-side perspective view thereof;

FIG. 3 is a front view thereof, the rear view being a mirror image ofthe front view;

FIG. 4 is a top view thereof;

FIG. 5 is a right-side view thereof, the left-side view being a mirrorimage of the right-side view; and,

FIG. 6 is a bottom view thereof.

CLAIM The ornamental design for a fastener, as shown and described.